A medical guide wire

Abstract

In a guide wire (1), a core line (2) has a proximal side wire (4) and a distal side wire (5), the latter of which is to be connected to a front end of the proximal side wire (4). The distal wire (5) is smaller in rigidity and superior in restitution than the proximal side wire (4). A concave portion (51) is provided on either the distal end surface of the proximal side wire (4) or a proximal end surface of the distal side wire (5). A convex portion (41) is provided on the other side wire among the distal end surface of the proximal side wire (4) and the proximal end surface of the distal side wire (5) The concave portion (51) and the convex portion (41) are interfit together, and pressure bonded by means of swaging or drawing procedure. This enables a manufacturer to sufficiently bond the distal side wire (5) and the proximal side wire (4) at a portion terminated in less than 100 mm from a distal end (11) of the guide wire (1), thus imparting a good restitution to the distal end (11) with a good supportability and torque-transmission maintained respectively.

Description

technical field [0001] The present invention relates to medical guidewires for the insertion of medical devices or equipment, such as catheters, into body cavities. Background technique [0002] Various types of guide wires have been used to introduce catheters for the purpose of blood vessel inspection and treatment, so that the guide wires are inserted to a destination before the catheter is inserted. [0003] Among the various guidewires, a guidewire has a core wire that tapers to form a tapered configuration, and has a sheath body disposed around a distal portion of the core wire. Some guide wires have a synthetic resin film covering the outer surface of the core wire. [0004] In order for the guide wire to travel smoothly through the arcuate region of the body cavity when the catheter is introduced, the physical properties of the guide wire are required to have good torque transmission and support capabilities to maintain the catheter and other related equipment inser...

AI Technical Summary

Problems solved by technology

This can result in insufficient support of the guidewire at 100-200 mm from the distal end of the corewire while holding the catheter and other associated equipment inserted along the guidewire into the body cavity

[0007] Soldering and brazing processes are more detrimental to torque transfer due to the position of the splice end away from the distal end of the core wire

In addition, these processes lead to heat treatment of the joint end, thus softening the joint end and reducing its mechanical strength

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